ci: add architecture suffixes and document WSL2 runner setup

.gitea/workflows/build-linux.yml

@@ -29,10 +29,11 @@ jobs:
       - name: Build TUI
         run: |
           export CGO_ENABLED=1
-          go build -o dist/tui_linux ./cmd/tui
+          export ARCH=$(uname -m)
+          go build -o dist/tui_linux_${ARCH} ./cmd/tui
 
       - name: Upload Artifact
         uses: actions/upload-artifact@v3
         with:
-          name: tui-linux-binary
-          path: dist/tui_linux
+          name: tui-linux-${{ github.sha }}
+          path: dist/